CN112212497A - Ultra-wideband ventilation silencer - Google Patents
Ultra-wideband ventilation silencer Download PDFInfo
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- CN112212497A CN112212497A CN202011049610.2A CN202011049610A CN112212497A CN 112212497 A CN112212497 A CN 112212497A CN 202011049610 A CN202011049610 A CN 202011049610A CN 112212497 A CN112212497 A CN 112212497A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/24—Means for preventing or suppressing noise
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- General Engineering & Computer Science (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Exhaust Silencers (AREA)
Abstract
The utility model provides an ultra wide band ventilation silencer, comprises the noise elimination unit of a plurality of periodic arrangements, and every noise elimination unit includes interconnect's little perforated plate layer and compound waveguiding layer, and the through-hole that runs through about a plurality of are arranged on the little perforated plate layer, and compound waveguiding layer comprises sound main waveguide and Helmholtz chamber, and sound main waveguide is a sound wave channel who runs through compound waveguiding layer, and the Helmholtz chamber sets up in compound waveguiding layer, is linked together between sound main waveguide and the Helmholtz chamber. The structure breaks through the original narrow-band problem by designing different structural parameters to combine the silencing frequency bands of the micro-perforated plate and the composite waveguide, meanwhile, the silencing quantity and the bandwidth of the structure can be greatly improved due to the coupling effect existing between the micro-perforated plate and the composite waveguide, the coupling effect is mainly embodied at low frequency, the noise can be effectively inhibited within the range of 100-2000Hz, the structure is communicated, and the structure can normally work in occasions needing ventilation.
Description
Technical Field
The invention relates to the technical field of noise control, in particular to an ultra-wideband ventilation silencer.
Background
In the day of vigorous productivity, more and more large-sized and heavy equipment such as diesel generator sets and some heavy construction machines are used in production life, and environmental noise pollution caused thereby is becoming more and more serious. The medium-high frequency noise has short wavelength, the attenuation is fast in the air, the long-distance transmission is difficult even if no measure is taken, but most of the noise generated in production and life is various low-frequency noise, and the low-frequency noise has long wavelength and is difficult to attenuate when being transmitted in a medium, so that the prevention and the treatment of the low-frequency noise are always the key and the difficulty in the noise prevention and treatment field, and are also the hot spots in the acoustic research field. In the prior art, the traditional sound insulation material is difficult to effectively control low-frequency noise and meet actual requirements. In recent years, the emergence of acoustic metamaterials and phononic crystals provides a new approach for solving the problem of low-frequency noise control, but the structures capable of realizing low-frequency broadband noise suppression are still few. The main problems are that: 1. the control of low-frequency noise usually requires a larger structure size to be realized, and the requirement of practical application requires that the structure size cannot be too large. 2. In order to realize low-frequency broadband noise elimination, a multi-stage noise elimination structure is required, and the noise elimination effect can be greatly influenced by the coupling existing between the structures. 3. The requirement that the silencer has ventilation and heat dissipation is difficult to meet.
Disclosure of Invention
The invention aims to provide an ultra-wideband ventilation silencer which can realize high-frequency noise and low-frequency noise broadband silencing on the basis of ensuring ventilation and heat dissipation aiming at the defects of the prior art.
In order to solve the technical problems, the invention provides the following technical scheme:
the utility model provides an ultra wide band ventilation silencer comprises the noise elimination unit of a plurality of periodic arrangements, its characterized in that: each silencing unit comprises a micro-perforated plate layer and a composite wave guide layer which are connected with each other, a plurality of through holes which penetrate through the micro-perforated plate layer up and down are distributed on the micro-perforated plate layer, each composite wave guide layer is composed of a main acoustic waveguide and a Helmholtz cavity, the main acoustic waveguide is an acoustic wave channel which penetrates through the composite wave guide layer, the Helmholtz cavity is arranged in the composite wave guide layer, and the main acoustic waveguide is communicated with the Helmholtz cavity.
Furthermore, a throat pipe is arranged in the composite waveguide layer, and the acoustic main waveguide and the Helmholtz cavity are communicated through the throat pipe.
Furthermore, a back cavity is coupled between the micro-perforated plate layer and the composite waveguide layer, and the through hole and the sound main waveguide are communicated with the back cavity.
Further, the length of the Helmholtz cavity is less than the length of the acoustic main waveguide.
Further, the cross-sectional area of the back cavity is larger than the cross-sectional areas of the through hole and the acoustic main waveguide.
Furthermore, the micro-perforated plate layer, the composite waveguide layer and the back cavity are of an integrated structure or a split structure connected with each other.
Further, the number of the silencing units is 4.
Furthermore, the material of the noise elimination unit is metal, nonmetal or composite material.
Furthermore, the noise elimination unit is of a cubic structure, the through hole is circular, the main acoustic waveguide is of a cylindrical structure, and the Helmholtz cavity is a cubic cavity.
Further, the length of the side of the bottom surface of the noise elimination unit is 72mm, the height of the micro-perforated plate is 1mm, the diameter of the through hole is 0.4mm, the filling ratio is 2.8%, the height of the back cavity is 19mm, the height of the composite waveguide is 70mm, the diameter of the bottom surface of the main acoustic waveguide is 6mm, the length of the throat pipe is 8mm, and the length, the width and the height of the helmholtz cavity are respectively 30mm, 18mm and 50 mm.
Compared with the prior art, the invention has the beneficial effects that: 1. each silencing unit is formed by coupling a micro perforated plate layer and a composite waveguide layer, different structural parameters are designed to combine silencing frequency bands of the micro perforated plate and the composite waveguide, so that the structure breaks through the original narrow band problem, and meanwhile, because the structure is mutually communicated, the silencing amount and the bandwidth of the structure can be greatly improved due to the coupling effect between the micro perforated plate layer and the composite waveguide layer, and the broadband silencing of noise in the range of 100-2000Hz is realized; 2. the through hole on the micro-perforated plate is communicated with the main acoustic waveguide, so that the silencer can be ventilated while meeting broadband noise elimination, and can be used in places needing air circulation; 3. the back cavity is arranged between the micro-perforated plate layer and the composite waveguide layer, the micro-perforated plate and the composite waveguide structure are connected by utilizing respective noise elimination characteristics of the micro-perforated plate and the composite waveguide structure and the back cavity, and importantly, different structural parameters are designed to combine noise elimination frequency bands of the micro-perforated plate and the composite waveguide structure, so that the structure breaks through the original narrow band problem, and meanwhile, the noise elimination amount and the bandwidth of the structure can be greatly improved due to the fact that the structure is mutually communicated and the coupling effect exists between the micro-perforated plate and the composite waveguide.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the internal structure of the muffler unit according to the present invention;
FIG. 3 is a cross-sectional view of a composite waveguide of the present invention;
FIG. 4 is a circuit diagram of an acousto-electric analogy method of the present invention;
FIG. 5 is a graph of surface normal acoustic impedance versus acoustic frequency for a sound attenuating structure in accordance with an embodiment of the present invention;
FIG. 6 is a graph showing the relationship between the sound-deadening amount and the sound frequency of the sound-deadening structure according to the embodiment of the present invention.
Wherein: 1-a micro-perforated plate layer; 2-a composite waveguide layer; 3-dorsal cavity; 11-a through hole; 21-an acoustic main waveguide; 22-helmholtz cavity; 23-a throat; a-the side length of the bottom surface of the silencing unit; h 1-microperforated panel layer height; h 2-Back Cavity height; h 3-composite waveguide height; r 1-via diameter; r2 — Acoustic Main waveguide diameter; l 1-throat length; a 2-Helmholtz chamber length; b2 — Helmholtz Cavity Width; c 2-Helmholtz Cavity height.
Detailed Description
For the understanding of the present invention, the following detailed description will be given with reference to the accompanying drawings, which are provided for the purpose of illustration only and are not intended to limit the scope of the present invention.
Fig. 1-3 show an ultra-wideband ventilation muffler, which is composed of a plurality of periodically arranged noise elimination units, each noise elimination unit includes a micro-perforated plate layer 1 and a composite wave guide layer 2 that are connected with each other, a plurality of through holes 11 that penetrate through the micro-perforated plate layer 1 up and down are arranged on the micro-perforated plate layer, the composite wave guide layer 2 is composed of a main acoustic waveguide 21 and a helmholtz cavity 22, the main acoustic waveguide 21 penetrates through the composite wave guide layer 2, the helmholtz cavity 22 is arranged in the composite wave guide layer 2, and the main acoustic waveguide 21 and the helmholtz cavity 22 are communicated with each other.
As a specific embodiment of the present invention, preferably, the muffler is composed of four muffler units in two rows and two columns, and an aluminum alloy is used as a base material; a throat 23 is arranged in the composite waveguide layer 2, and the main acoustic waveguide 21 is communicated with the Helmholtz cavity 22 through the throat 23; a back cavity 3 is coupled between the micro-perforated plate layer 1 and the composite waveguide layer 2, and the through hole 11 and the sound main waveguide 21 are both communicated with the back cavity 3; wherein, each noise elimination unit is the cuboid structure, and bottom surface length of side a equals 72mm, and high h equals 90mm, and wherein the height of little perforation plate layer 1, back of the body chamber 3 and compound waveguide layer 2 is h respectively1＝1mm，h219mm and h370 mm; the through hole 11 on the micro-perforated plate layer 1 is circular and has a diameter r10.4mm, and a filling ratio sigma of 2.8%; the main acoustic waveguide 21 has a diameter r26mm cylindrical structure, throat 23 length l1The length, width and height of the helmholtz cavity 22 are 8 mm: a is2＝30mm、b2＝18mm、c2＝50mm。
The sound wave enters from one side of the micro-perforated plate layer 1 of the silencing unit and sequentially passes through the through hole 11 on the micro-perforated plate layer 1, the back cavity 3 and the sound main waveguide 21 of the composite waveguide layer 2 to reach the transmission region. The silencing quantity of the silencing structure
Wherein
tIRepresents the sound intensity transmission coefficient of the sound-deadening structure,
d is the width of the noise elimination structure, f represents the frequency of the incident sound wave, and Z is rho0c0Representing the characteristic impedance of air, Z0Represents the impedance of the sound-attenuating structure, wherein: rho0＝1.21kg/m3，c0343m/s respectively represent the air density and the sound velocity in air, whereby we can derive the relation between the amount of sound attenuation TL of the sound attenuating structure and the structural parameters and the coupling effect. We can obtain the structure according to the acousto-electric analogy in FIG. 4The relationship between the acoustic impedance and each structural parameter satisfies P0＝P1+P2In which P is0Denotes the total sound pressure, P1Denotes the sound pressure, P, of the microperforated laminate2Representing the sound pressure of the composite waveguide layer, the impedance Z of the acoustic damping structure0Satisfies the following conditions: z0＝Z1+Z2Wherein: z1Representing the acoustic impedance, Z, of the microperforated sheet2Representing the acoustic impedance of the composite waveguide layer. According to the March theory and the sound-electricity analogy relation of the micro-perforated plate, Z can be calculated1And Z2Comprises the following steps: z1＝R1+jXL1-jXC1，
Wherein: xL＝2πfL，
R represents resistance, analogous to acoustic resistance in acoustics, L represents inductance, analogous to acoustic mass in acoustics, C represents capacitance, analogous to acoustic capacitance in acoustics, and j is an imaginary unit. Using the acousto-electric analogy method can obtain: l ═ ρ L/A2，
Wherein V0The volume of the helmholtz chamber is shown, from which the relation between the amount of damping TL and the respective damping junction parameters can be derived. Fig. 6 shows that the muffling amount of the muffling structure in the present embodiment for noise of each frequency can achieve a good muffling effect within the range of 100-2000 Hz.
The above embodiments are merely illustrative of the technical concept and structural features of the present invention, and are intended to be implemented by those skilled in the art, but the present invention is not limited thereto, and any equivalent changes or modifications made according to the spirit of the present invention should fall within the scope of the present invention.
Claims (10)
1. The utility model provides an ultra wide band ventilation silencer comprises the noise elimination unit of a plurality of periodic arrangements, its characterized in that: each noise elimination unit comprises a micro-perforated plate layer (1) and a composite waveguide layer (2) which are connected with each other, a plurality of through holes (11) which penetrate through the micro-perforated plate layer up and down are distributed on the micro-perforated plate layer (1), the composite waveguide layer (2) is composed of a main sound waveguide (21) and a Helmholtz cavity (22), the main sound waveguide (21) is a sound wave channel which penetrates through the composite waveguide layer (2), the Helmholtz cavity (22) is arranged in the composite waveguide layer (2), and the main sound waveguide (21) and the Helmholtz cavity (22) are communicated with each other.
2. The ultra-wideband ventilation muffler of claim 1, wherein: a throat pipe (23) is arranged in the composite waveguide layer (2), and the acoustic main waveguide (21) is communicated with the Helmholtz cavity (22) through the throat pipe (23).
3. The ultra-wideband ventilation muffler of claim 2, wherein: a back cavity (3) is coupled between the micro-perforated plate layer (1) and the composite waveguide layer (2), and the through hole (11) and the sound main waveguide (21) are communicated with the back cavity (3).
4. The ultra-wideband ventilation muffler of claim 3, wherein: the length of the Helmholtz cavity (22) is less than the length of the acoustic main waveguide (21).
5. The ultra-wideband ventilation muffler of claim 4, wherein: the cross-sectional area of the back cavity (3) is larger than the cross-sectional areas of the through hole (11) and the sound main waveguide (21).
6. The ultra-wideband ventilation muffler of claim 5, wherein: the micro-perforated plate layer (1), the composite waveguide layer (2) and the back cavity (3) are of an integrated structure or of a split structure connected with each other.
7. The ultra-wideband ventilation muffler of claim 6, wherein: the number of the silencing units is 4.
8. The ultra-wideband ventilation muffler of claim 7, wherein: the material of the noise elimination unit is metal, nonmetal or composite material.
9. The ultra-wideband ventilation muffler of claim 8, wherein: the noise elimination unit is of a cubic structure, the through hole (11) is circular, the main acoustic waveguide (21) is of a cylindrical structure, and the Helmholtz cavity (22) is of a cubic cavity.
10. The ultra-wideband ventilation muffler of claim 9, wherein: the side length of the bottom surface of the noise elimination unit is 72mm, the height of the micro-perforated plate (1) is 1mm, the diameter of the through hole (11) is 0.4mm, the filling ratio is 2.8, the height of the back cavity (3) is 19mm, the height of the composite waveguide (2) is 70mm, the diameter of the bottom surface of the sound main waveguide (21) is 6mm, the length of the throat pipe (23) is 8mm, and the length, the width and the height of the Helmholtz cavity (22) are respectively 30mm, 18mm and 50 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011049610.2A CN112212497A (en) | 2020-09-29 | 2020-09-29 | Ultra-wideband ventilation silencer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011049610.2A CN112212497A (en) | 2020-09-29 | 2020-09-29 | Ultra-wideband ventilation silencer |
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| CN112212497A true CN112212497A (en) | 2021-01-12 |
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| CN202011049610.2A Pending CN112212497A (en) | 2020-09-29 | 2020-09-29 | Ultra-wideband ventilation silencer |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0883038A (en) * | 1994-09-13 | 1996-03-26 | Ricoh Co Ltd | Silencer |
| CN101545424A (en) * | 2008-03-28 | 2009-09-30 | 通用汽车环球科技运作公司 | Air induction housing having a perforated wall and interfacing sound attenuation chamber |
| JP2013234808A (en) * | 2012-05-10 | 2013-11-21 | Kurimoto Ltd | Silencer for ventilation duct |
| CN107360493A (en) * | 2017-09-07 | 2017-11-17 | 中国船舶重工集团公司第七〇九研究所 | Modified Reed bore muffler |
| CN206724445U (en) * | 2017-04-28 | 2017-12-08 | 湖南城市学院 | A kind of silencer for HVAC ventilating system |
| CN208164418U (en) * | 2018-05-02 | 2018-11-30 | 南昌航空大学 | A kind of honeycomb interlayer sound absorption structure of built-in son back chamber |
| CN109397795A (en) * | 2018-10-24 | 2019-03-01 | 北京航空航天大学 | A kind of multi-frequency selection noise elimination noise reduction structure and preparation method |
-
2020
- 2020-09-29 CN CN202011049610.2A patent/CN112212497A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0883038A (en) * | 1994-09-13 | 1996-03-26 | Ricoh Co Ltd | Silencer |
| CN101545424A (en) * | 2008-03-28 | 2009-09-30 | 通用汽车环球科技运作公司 | Air induction housing having a perforated wall and interfacing sound attenuation chamber |
| JP2013234808A (en) * | 2012-05-10 | 2013-11-21 | Kurimoto Ltd | Silencer for ventilation duct |
| CN206724445U (en) * | 2017-04-28 | 2017-12-08 | 湖南城市学院 | A kind of silencer for HVAC ventilating system |
| CN107360493A (en) * | 2017-09-07 | 2017-11-17 | 中国船舶重工集团公司第七〇九研究所 | Modified Reed bore muffler |
| CN208164418U (en) * | 2018-05-02 | 2018-11-30 | 南昌航空大学 | A kind of honeycomb interlayer sound absorption structure of built-in son back chamber |
| CN109397795A (en) * | 2018-10-24 | 2019-03-01 | 北京航空航天大学 | A kind of multi-frequency selection noise elimination noise reduction structure and preparation method |
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Application publication date: 20210112 |
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